1. Doctoral Candidate, Tongji Univ., School of Transportation Engineering, Shanghai 201804, CN; and Jiangsu Transportation Research Institute, Nanjing 211112, CN, e-mail: pyq@jstri.com
2. Director, Jiangsu Transportation Research Institute, Nanjing 211112, CN, e-mail: zzx@jstri.com
3. Vice President, Jiangsu Transportation Research Institute, Nanjing 211112, CN, e-mail: crj@jstri.com